Hydraulic-elevator-control system



H- C. RANDALL, DECD. A. L. RANDALL. exrscurmx'. HYDRAULIC ELEVATOR CONT-ROI. SYSTEM- I APPLICATION FILED OCT. I3, 1919. 1,372,191.

Patented Mar. 22, 1921.

y 2 SHEETS-SHEET I.

Eng-l,

WITNESS Hop/177a 6. lib/magma,

@v ATTORNEYS 4 H. C. RANDALL, DEC'D.

A. L. RANDALL, EXECUTRIX.

HYDRAULIC ELEVATOR .GONTROL SYSTEM.

APPLICATION FJLED ocr.13,1919.

1,372,191. Patented Mar. 22, 1921.

2 SHEETS-SHEET 2.

ATTORNEYS.

HORA'IIO c. RANDALL, nncnasnnrarn or SAN rimivcrsco, cALIFORnIA; BY ANNA L. RANDALL, EXEGUTRIX, or SAN rna vcrsco, CALIFORNIA.

HYDRAULIC-ELEVATQR-colvrnoL SYSTEM.

Specification of Letters Patent Patented B131. 22,1921,

Application filed October 13,1919. Serial No. 330,455.

To all whom it may concern: 1 y

' Be it known that HonA'rIoC. RANoaLL, deceased, in his time a citizen of the United States,and a resident of the city and county 7 of San Francisco, State of California, did

i The invention possesses other advanta' geous features, some of which, with the fore going, will be set forth at length 1n the fo1- lowing description, where that form of the invention which has been selected for illustration in the accompanying drawings, will In said drawings is,

be outlined in full. y shown one embodlmentof the lnventlon, but

it is to be understood that the invention is not limited to such form, since'the invention, as expressed in the claims,may be embodied in a plurality of forms. i Referring to said drawings: a

Figure 1 is an elevation of an elevator shaft and an elevator car therein equipped with the apparatus of this'invention.

Fig. 2 is a front elevation ofthe elevator control lever actuating means carried by the car. a a i Fig. 3 is a vertical transverse section of the mechanism shown in Fig.- 2; 1

Difficulty is experienced in the operation ofhydraulic elevators, due to the creeping of the elevator car when the control lever is in neutral position. Thls difficulty is particularly noticeable when the car is brought to astop at a floor. The present invention contemplates the provision of means for moving the controllever from neutral position in a direction to counteractthe creeping of the car, and thereby holdthe car station-1 ary,'and this means isthrown 1nto operation by the unlocking of an elevator shaft door.

The elevator shaft is provided at each floor with a lock 2 which is engaged by a bolt 3 carried by the shaft door 4,. for bolding the door locked in the closed position. Thls lock is preferably constructed as shown in the co ending application of H. G. Ran:- dallyserial No. 283,852, filedin the Patent Oflice on March 20, 1919. Each lock is provided with an actuating lever 5 projecting from the lock casing and adapted to be rocked to release the bolt 3, by the shoe 6, carried by the elevator car and movable into position to actuate the lever 5 by the pedal :7. Depression of the pedalmoves the shoe into position to actuate the lever 5, and the pedal is usually depressed as the elevator approaches a floor at which passengers are to betaken on or discharged, so that the door is unlocked as the elevator car moves into position. The pedal, however, may be operated to unlock'the door aftei the car has been brought to rest ata floor,

Dispo'sedinthe elevator shaft isa vertically movable, vertically disposed wire 8 weighted at its lower end and supported at its upperend by a spring 9, so that it is, verticallyimovable. The wire is provided at points adjacent the locks2 with fixedenlargements orabutrnents 12 and each lock is provided with a lever 13, connected to the actuating lever 5, and slidably engaging the PATENT OFFICE wire immediately below the adjacent abut-'= ment 12. 1 Consequently, when the lever 5 is moved to unlock the door, the lever 13 is raised, raising the wire 8. When the lever 5is released, the wire moves downward to its normal position. i

Carried by the wire adjacent its upper end is a slide comprising a conducting portion 14: and two insulatm portions 115, on:

either side of the conducting portion. :Arranged on opposite sides of theislide and contacting therewith aretwo fixed contacts 16- -17 of the electric circuitil8. "Whenthe wire isin the normal position, the contacts- 16--17-en"gage an insulating portion 15, maintaining the electric circuit18 open, but when the wire is raised, the conducting portion l lis moved into engagement with the contacts 16-17, closing the circuit. Arranged in the circuit is a source of current, such as lthebattery 19 and a solenoid 21, carried'bythe elevatorcar. i i

, The movement of the caris controlled by the lever22, securedto theshaft 23,which is suitably-connected to thevalves of the hydraulic motor; Movement of the: control lever, inone. direction. from its neutral position causes the hydraulic motor to operate to raise the car and movement of the lever in the opposite direction causes the hydraulic motor to operate to lower the car. Means are'provided for causing a creeping movement of the car to move the control lever 22 in a direction to counteract the creeping movement. f

Depending from the car area pair of vertical guides 24, upon which is disposed a vertically movable carriage 25, the carriage being provided with rollers 26 engaging the guides andbeing provided with a counten weight 27. Disposed in the elevator shaft is aiixed vertical member or cable 28 which is also engaged in rollers 29, journaled on the carriage. h eans are provided for clamping the carriage to the fixed vertical member 28, so that the carriage is held sta tionary in the shaft and this means is operated bytheunlocking of a shaft door. Arranged in the carriage is a cylinder 31,

v having aspring-pressed piston 32 therein,

the fixed cable 28.

with respect to the carriage.

to which'is, secured the piston rod 33. Secured to the outer end ofthe piston rod, is a shoe 34:, which is, adapted to. be moved by the piston, to-clamp the cable 28 to the carriage.-' Thepiston is operated by fluid un-v der pressure,'fpreferably air,'whichis conveyed to thecar through the flexible conduit .35. Disposed in the flexible conduit and mounted onithe car is 'a three-way valve 56, the operating lever 37 .of which is connected-to the core 38 of the solenoid 21.

closed, that the carriage is held against ver- .tlcal movement, so that a movement of the car causesiat relative movement of the car This move- -'ment is femployedto move the control lever22in adirection to counteract the movement of the car isecured to the shaft 23 i :is a lever 41 havinga forked end 42 engaging the piston rod 33, so that asthe carriage movesrelatively to the car, the shaft 23 is movedto'actuate the valves in the hydraulic motor-43 in such ,manner as to stop the movement of the-car.

.7 What is claimed is; V 1

1. The combination with an elevator shaft provided with doors, of an elevatorcar in said shaft, a hydraulic motor for movlng i said car, aleverjfo'r controlling the operation ofsaid motor, locks forholding said doorsclosed, means operative by a movement ofzthe car for moving said lever, and

'a movement of the car to actuate said controlling means.

3. The combination with an elevator sha l't provided with doors, of locks for holding the doors closed, an elevator car in said shaft, a hydraulic motor for moving said car, a motor controlling device, a vertically mo able carriage on the car connected to said device, a fixed vertically disposed member in said shaft normally slidably engaged by said carriage, and means operative by the unlocking of a door for clamping said carriage to said fixed vertical member.

at. The combination with an elevator shaft provided with doors, of locks for holding the doors closed, an elevator car in said shaft, a hydraulic motor for moving the car, a motor controlling device on said car, a movable carriage on said car connected to said 'contolling device, and means operative byrthe unlocking of a shaft door for clamping said carriage against movement, whereby a movement of the car produces a relative movement of the car with respect to the carriage.

5. The combination with an elevator sha it provided with doors, of locks for holding the doors in closed position, an elevator ear in said shaft, a hydraulic motor for moving said car, a motor control device, a fixed vertically disposed member in said shaft, a vertically movable carriage on said car connected to said control device and normally out of tight engagement with said vertically disposed member, means on the carriage adapted to clamp said member, and means operative by the unlocking of a. door for moving said clamping means to engage said member.

6. The combination with an elevator shaft provided with doors, of locks for holding said doors in the closed position, an elevator car in said shaft, a hydraulic motor for moving said car, a motor control device arried by the car, a vertically movable carriage arranged on said car and connected to said control device, a fixed vertical element in said shaft associated with said carriage, means for clamping said carriage to said element, electromagnetic means controlling the actuation of the clamping means, and means operative by the unlockingof a door for actuating said electromagnetlc means.

7. The combination with an elevator shaft ll-T provided. with doors, of locks for holding said doors in the closed position, an elevator car 1n said shaft, a hydraulic motor for moving said car, a control device for said motor, at vertically movable carriage on the car connected to said control device, a vertically 'disposedfixed cable in said shaft with which said carriage normally makes free sliding contact, a cylinder on said carriage, a piston in said cylinder, meansconnected to the piston for clamping the carsaid cylinder, a solenoid for moving said valve, a circuit for seidsolenoid andmeens operative by the unlocking of a door for closing the solenoid circuit.

ANNA L. RANDALL, Ewecutrim of the estate of H oratz'o 6'. Ram- (ZaZZ, deceased. 

